ITPEC FE Morning October 2020 Question 20
ITPEC FE Morning October 2020 — Question 20 of 80
DRAM (Dynamic RAM) — memory that requires periodic refresh and serves as main memory.
DRAM stores each bit in a capacitor, which leaks charge over time, so the memory controller must refresh it periodically. It is used as the main memory (RAM) of a PC.
Why not others:
- (b) NAND/NOR flash → SSD — describes flash memory, which is non-volatile
- (c) Byte-unit erase/write, non-volatile — describes EEPROM
- (d) Flip-flops → cache — describes SRAM (Static RAM)
Key distinction:
- DRAM — capacitor-based, needs refresh, cheap, used for main memory
- SRAM — flip-flop-based, no refresh, fast but expensive, used for cache
- Flash — non-volatile, NAND/NOR types, used for SSD/USB drives
- EEPROM — non-volatile, byte-level erase/write, used for firmware/settings
AI-generated — may contain errors
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